Scale-free brain functional networks

Details Scale-free brain functional networks Scale-free brain functional networks

2003-09-03

arxiv.org/abs/cond-mat/0309092v3

Physical Review Letters 94, 018102 (2005)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 5 figures, 2 tables

Scientific paper

10.1103/PhysRevLett.94.018102

Functional magnetic resonance imaging (fMRI) is used to extract {\em functional networks} connecting correlated human brain sites. Analysis of the resulting networks in different tasks shows that: (a) the distribution of functional connections, and the probability of finding a link vs. distance are both scale-free, (b) the characteristic path length is small and comparable with those of equivalent random networks, and (c) the clustering coefficient is orders of magnitude larger than those of equivalent random networks. All these properties, typical of scale-free small world networks, reflect important functional information about brain states.

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